chore: Update readme (#675)

- Add maven central badge
- Add push filter to Java CI badge
- Change to https links
- Improve text
- Remove link to plugin as it is no longer possible to link directly to a plugin in the plugin page

README.md

@@ -1,19 +1,19 @@
-[![Java CI](https://github.com/grails/gorm-mongodb/actions/workflows/gradle.yml/badge.svg)](https://github.com/grails/gorm-mongodb/actions/workflows/gradle.yml)
-
 # GORM for MongoDB
+[![Maven Central](https://img.shields.io/maven-central/v/org.grails/grails-datastore-gorm-mongodb.svg?label=Maven%20Central)](https://central.sonatype.com/artifact/org.grails/grails-datastore-gorm-mongodb)
+[![Java CI](https://github.com/grails/gorm-mongodb/actions/workflows/gradle.yml/badge.svg?event=push)](https://github.com/grails/gorm-mongodb/actions/workflows/gradle.yml)
 
-This project implements [GORM](http://gorm.grails.org/latest/) for the MongoDB Document Database.
+This project implements [GORM](https://gorm.grails.org) for the MongoDB Document Database.
 
-NOTE: This source code here is for version 6.x and above. For prevoius versions' source see the relevant branch on the [Grails Data Mapping project](https://github.com/grails/grails-data-mapping/tree/5.x/grails-datastore-gorm-mongodb).
+>[!NOTE]
+>The source code in this repository is version 6.x and above. For previous versions, see the [relevant branch](https://github.com/grails/grails-data-mapping/tree/5.x/grails-datastore-gorm-mongodb) on the [Grails Data Mapping project](https://github.com/grails/grails-data-mapping).
 
 For more information see the following links:
 
-* [Documentation](http://gorm.grails.org/latest/mongodb/manual)
-* [API](http://gorm.grails.org/latest/mongodb/api)
-* [Grails Plugin](https://grails.org/plugins.html#plugin/mongodb)
+* [Documentation](https://gorm.grails.org/latest/mongodb/manual)
+* [API](https://gorm.grails.org/latest/mongodb/api)
 
 For the current development version see the following links:
 
-* [Beta Documentation](http://gorm.grails.org/snapshot/mongodb/manual)
-* [Beta API](http://gorm.grails.org/snapshot/mongodb/api)
+* [Snapshot Documentation](https://gorm.grails.org/snapshot/mongodb/manual)
+* [Snapshot API](https://gorm.grails.org/snapshot/mongodb/api)